3D maze in browser controlled by Small Basic

[AbsoluteBeginner]

Hi all. 

Today I finally tested the robot manual control program that Chat and I made.
During the test I saw two runtime errors.

1. When I send the command "forward=1", the robot often moves 1.5 or 2 steps.
   
2. When I send the command "animate=...", then after performing the turn the robot makes a step. But I don't need this step.
   

Please tell me where to look for the problem?